Arm rest



FIG. 1 is a plan view of an arm rest showing my new design;

FIG. 2 is a side view thereof, showing the arm rest in a mediate position;

FIG. 3 is an end view thereof showing the arm rest in its upper-most position;

FIG. 4 is a bottom view thereof;

FIG. 5 is a side view thereof like FIG. 3, but taken in the opposite direction;

FIG. 6 is an end view thereof substantially similar to FIG. 3, but showing the arm rest in its lower-most position; and

FIG. 7 is a rear perspective view of the arm rest shown in its mediate position. 

The ornamental design for an arm rest, as shown and described. 